Self-measuring oil-pump.



N0. 790,786. PATENTED- MAY 23, 1905.

SHELLABARGER. SELF MEASURING OIL PUMP.

J. B. DAVIS & F. W.

APPLICATION FILED NOV. 3. 1904.

Z SHEETS-SHEET 1. H-k.

WHNEEEEE- JM NNW No. 790,786. PATENTED MAY 23, 1905. J. B. DAVIS & F. W. SHBLLABARGBR.

SELF MEASURING OIL PUMP.

APPLICATION FILED NOV. 3. 1904.

` 2 SHEETS-SHEET 2.

WITH WZ ESE'EE- NTTnD STATES Patented May 23. 1905.

PATENT Trice.

JOHN B. DAVIS AND FLAVIUS W. SHELLABARGER, OF DAYTON, OHIO.

SELF-MEASURING OIL-PUMP..

SPECIFICATION forming part of Letters Patent No. 790,786, dated May 23, 1905.

. Application iled November 3, 1904. Serial No. 231,209.

To @ZZ whom it may concern.'

Be it known that we, JOHN B. DAvIs and FLA- vIUs W. SHELLABARG ER, citizens ofthe United tion of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this spcciiication.

This invention relates to improvements in self-measuring oil-pumps of the class adapted for use in retail stores, where oil is sold in small quantities.

The object of the invention is to provide a pump in which there is no lost motion-that is to say, which measures and discharges oil upon each single stroke; and to this end the invention consists of the construction and details, as hereinafter set `forth in the description and pointed out in the claims.

Preceding a detail description ot' the invention reference is made to the accompanying drawings, of which- Figure 1 is a front elevation of the pump removed from the tank. Fig. 2 is a side elevation of the. pump, the oil-tank being shown in section. Fig'. 3, Sheet 2, is an elevation of the reversed side of the pump as shown in Fig. 1. Fig. 4 is an enlarged sectional View on the line :l: ab' of Fig. 3. Fig. 5 is a sectional view on the line 1/ y of Fig. 4. Fig. 6 is a detail view oi' the indicator actuating' mechanism. Fig. 7 is a longitudinal sectional View of the d ischarge-spout and siphon. Figs. 8 and 9 are views ,of the driving mechanism for the pistons.

In a detail description of the invention similar reference characters indicate corresponding parts.

The oil-tank 1 may of course be of any suitable capacity and is inclosed at the top by alid with suitable openings for the mounting ot' the pump,which consists of twin cylinders 2,which are ot' similar size and may be of any desired capacity. In the presentinstance the Said cylinders have each a half-gallon capacity. These cylinders are locatedwithin the oil-tank and are united to a base 3. This base contains suitable chambers-lO and 11, the former being controlled by an inlet suction-valve 8 and chamber 11 being supplied through a similar valve 9.

Below each ot' the pistons 4 there is an inlet-port 12, leading to the cylinder and through which the oil is conveyed under suction to said cylinder and is expelled under pressure from the piston. The piston 4 in each cylinder is provided with the usual packing-cups 6,which are pressed out in suitable contact with the interior oi the cylinders by rings 5, which lie in grooves against the inner sides of the packing-cups.

13 designates a pipe leading from each of the chambers 11 and through which the oil is conveyed to thedischarge-spout 15. The construction of the discharge-spout is clearly shown in Fig. 7, where 16 designates an auxiliary chamber with the lower portion of which the said discharge-pipe 13 communicates.I The passage between this chamber 16 and the discharge-spout is provided with a flap-valve 17, which is held open by the force of the discharging oil until the oil within said chamber is discharged. When the pipe 13 has eX- hausted its discharge of oil to said chamber 16, the oil is siphoned from said chamber to the point 18,owing to the lowest point 18 of the valve-opening being above the point 18' ofthe discharge-pipe.

The base 3 is braced to the upper base 19 on one side by the supply-pipe 13 and on the other side by a tie-rod 14, said base 19 being mounted upon asubbase 19/, which rests upon the top of the tank. Rising from this base 19 are four standards,constituting a framework 20, which supportsat its upper end afront and back plate 21 and 22, respectively. 23 designates a crank-shaft which is journaled in said plates 21 and Z2 and has upon one end thereof a hand-crank 24. There are also rigidly mounted upon said shaft two chain-wheels Q7, each of which has one end of achain 26 connected to it, said chains extending in opposite directions and having their far ends connected with the ends of two vertically-reciprocating bars 25. These bars are guided by the IOO front and rear plates 21 and 22 and carry projections 28 upon their lower ends, to which the piston-rods are attached. It will be seen that the chains 26 impart reversed movements to the pistons 4 in each operation of the crank 24 and that when one of the twin cylinders is discharging its contents through the spout 15 the other cylinder is filling. There is also mounted on the crank-shaft 23 a pinion 29, which engages a segment-gear 30, that is pivoted to the upper frame. 31 designates two arms which are pivoted to the body of the segment 8O and are drawn together by a spring 32. The upper ends of these arms are provided each with a doubletoothed ratchet-pawl 33, which engages a ratchetwheel 34 at opposite sides, said ratchet-wheel being mounted upon a shaft 35, which carries a pointer 36, which moves over the face of a total-measuring dial 35. The pointer and dial are used to ascertain at any time the total amount of oil that has been drawn from the tank. The features of the double-toothed pawls 33 are instrumental in obviating any lost motion between the movements of the arms 31 and the ratchet-wheel 34. In other words, it is necessary for the pawls to engage the ratchet-wheel on one or the other side as soon after motion is imparted to said arms as possible in order that a correct movement will be imparted to the dial-hand 36. Therefore in the event that one tooth of said pawl is not in a position to immediately engage said ratchet-wheel the other tooth will. Upon the frame 2O there is also provided a perpendicular retail-price scale 37, over which an index or pointer 38 is movable, said pointer being fixed to one of the reciprocating bars 25. (See Fig. The full measuring capacity of this scale is commensurate with the capacity of either of the cylinders 2, and the amount of oil discharged through the spout 15 may be This means comprises a series of stops' 39, which are fixed at suitable points-say quarts, pints, and half-pints-to an upright shaft 40, the latter being mounted in the upper base 19 at its lower end and its upper end being held in any suitable support. The shaft 40 has a turning movement, so that either one of the stops 39 may be placed in a position to make contact with the lip 41 on either one of the bars 25. (See Fig. 9.) These stops are engaged above by the lip 41. The rod 40 is turned by means of a handle 42 projecting therefrom, as shown in Fig. 3.

Having described our invention, we claim- 1. In a measuring-pump, two cylinders having pistons located therein, an operating-shaft with means attached thereto for operating the pistons of both cylinders therefrom, a vertically-reciprocating bar connected with each of said piston-rods, chain-wheels connected to said operating-shaft, chains connected to the reciprocating bars and said wheels whereby the movement is imparted from the operating-shaft to the pistons, a stationary pricescale giving the money values of fractional parts of a gallon discharged from one or the othervcylinder, and a pointer fixed to one of the vertically-reciprocating bars and movable along said price-scale to indicate the values of the quantities of oil discharged from the cylinders, as herein set forth.

2. In an oil-pump of the class specified, the combination with an oil-tank, f two measuring-pump cylinders having pistons located therein, an operating-shaft, a vertically-reciprocating member connected with each of the pistons, flexible connections between said reciprocating bars and the operating-shaft, an indicator to show the total amount of oil discharged from the tank, a segmentgear driven from the operating-shaft, arms having double-toothed pawls pivoted to said segmentgear` and a ratchet-wheel fixed to the shaft of the indicator, substantially as set forth.

In testimony whereof we afiix our signatures in presence of two witnesses.

JOHN B. DAVIS. FLAVIUS W. SHELLABARGER.

Witnesses:

R. J. MCCARTY, W. G. POWELL. 

